Mark. I Sequence 1
Structure of DNA
DNA is structured with four main base components (Adenine, Thymine, Guanine, and Cytosine) that air paired together with only one other and can not pair with a different base (Adenine always bonds with thymine and quanine always bonds with cytosine) these pairs are always paired with there corresponding base and can not be paired with another base. The paired base is made into a strand of many pairs and twisted forming a double helix of base components. DNA is within the nucleus of cells and within the 23 chromosomes that people have within each cell. DNA is in almost every living thing and within humans it is very similar but with around a one percent differences that makes each person very different.